6644591608 has 8 divisors (see below), whose sum is σ = 12458609280. Its totient is φ = 3322295800.

The previous prime is 6644591581. The next prime is 6644591617. The reversal of 6644591608 is 8061954466.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415286968 + ... + 415286983.

It is an arithmetic number, because the mean of its divisors is an integer number (1557326160).

Almost surely, 2^6644591608 is an apocalyptic number.

It is an amenable number.

6644591608 is a deficient number, since it is larger than the sum of its proper divisors (5814017672).

6644591608 is a wasteful number, since it uses less digits than its factorization.

6644591608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830573957 (or 830573953 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 6644591608 is about 81514.3644273818. The cubic root of 6644591608 is about 1879.9924181073.

The spelling of 6644591608 in words is "six billion, six hundred forty-four million, five hundred ninety-one thousand, six hundred eight".